Process of manufacturing acetic anhydrid.



UNITED STATES PATENT OFFICE; WALLACE A. IBEATTY, OF NEW YORK, Y., ASiIG-NOR, BY DIRECT ANIf) ASSIGNMENTS, T0 GEORGE W. BEADIi-E, OF NEW YORK, N. Y.

- PROCESS OF MANUFACTURING ACETIC ANHYDRID.

consists in the .met ods of procedure hereinafter described and set forth in the claims.

The object of the invention is to devise a process for cheaply manufacturing acetic anhydrid on a largescale whereby to obtain] large quantities'thereof for ordinary commercial purposes.

The rocess consists referabl in unitin P y e the substances in substantially the following proportions and in the following arranged order of steps: I, I 4

(1). Sulfuric anhydrid (S0 eighty pounds .and. carbon tetra-chlorid (001,

slightly morethan'one hundred and fiftyfour pounds are allowed to react together either by passing the sulfuric 'anhydrid through the carbon tetra-chlorid heated to its boiling point and with proper condensation of the products of the reaction, or by passing the vapors through a heated tube at about 80- C. and with proper condensation of the products of the reaction; viz:

SO +CCl -:SO CI +COCI,.

I Sulfuryl Carbnnyl chlorid. chlorid.

Disulfuryl Carbonyl chlorid. hlolid Probably both reactions occur more or less.

2 The mixture so,o1,+ooo1, is-

allowed to react with dry alkali metal acetate or with alkaline earth metal acetate or with a mixture of both (viz. sodium acetate or calcium acetate or mixture of the two) care be ng taken to prevent overheating due .Specificationof Letters Patent.

No Drawing. Application filed April 30. 1912, Serial No. 694,275. f 743,420.

Patented Q01). 13, .1914. Renewed January 21, 1913. Serial No.

The chemicals are used in substantially the ';following proportions: fso woibs.)+oo1, 1s41bs.)+8Nao1-i ooo z (656. lbs.) Na S,O Na 'CO lNaCl non co o.

The reaction of S0 and carbon tetra- ;chlorid onthe alkali salt may be produced so that acetyl chlorid is formed as an interimedlate product and the' anhydrid will be produced by the further action of acetyl' chlorid on the alkali or alkaline earth salts, iVlZZ 2(1) so +oor+emori ooo= Na sO,+3CH COCl|-NaCl+CO ;(2) 3CH COCl+3NaCH COO:

j 3(CH CO) O+3NaCl. The acetic anhydrid is distilled from the resultant mass preferably, in a vacuum.

. lVhile certain specific instances arejllerein.

given for carrying out thep rocess itis to be understood that such limitations need not necessarily beadhered to, but rather that the invention is to, be interpreted within the scope of the general claims.

What is claimed as new is:

1. A process of producing certain anhydrids which comprises mixing sulfuric an' hydrid with carbon tetra-chlorid and reacting with the products thereby produced,

upon a salt of the acid,-the .anhydrid of 'which is. desired, substantially asdescribed.

2. A process of producing acetic anhydrid which comprises mixing sulfuric anhydrid with carbon tetra chlorid and reacting 'with' the products thereby produced,

upon an alkali metal acetate, substantially as described.

-3. A process of producing acetic anhydridwhich comprises mixing sulfuric anhydrid with carbon tetra-chlorid and reacting with the products thereby produced, upon an acetate, substantially .as described.

4. A process of producing acetic anhydrid which comprises mixing sulfuric anhydrid with carbon tetra-chlorid and reacting with the; products thereby produced, uponau alkali metal acetate and an'alkaline.

scribed.

earth metal acetate, substantially as de- 5. A process of producing acetic anhydrid which comprises mixing'sulfuric anhydrid with carbon tetra-chlorid-and react of ahydrocarbon and reacting with theproduets thereby produced, upon sodium'. and calcium acetates, substantially as de' Scribe'd.

7 A process of pro'ducing'an organic anhydrid which comprises passingsulfuric anhydrid through heated carbon tetrachlorid" [and subjecting the products thereby duced tothe actionof an alkali metalsalt ofthe acid, the anhydrid of which is desired pro- substantially as described:

8. A process ofproducing an .organicamhydrid which comprises .passings'ulfuric an} ihydridthrough carbon 'tet'ra'fchlorid heated to boiling pol-nt' and treating 1 the reaction products thereof With'a .dry alkali metal salt of said organicacid substantiallyas de scribed.

1 hydrid with an or'ganic tetraec lorid and reacting With'the products thereby produced,

uponanalkali metal salt to obtain a chlorid of an organic acid radical, and then treating ;the chlorid so prodficedwith an alkali salt.

dr id,"substantial1y as described.

10. A .processof producing acetic anhydridwhich comprises reacting upon an ace- "t'atewith the reaction products of ahalogen substitution product of a hydrocarbon of the paraflin series, and an anhydrid of a relatively strong'acid, at a reacting temperature.

fill, A processof making an anhydrid of anorganic acid which comprises reacting with .a heatedmixture of the reaction products of an anhydrid of a mineralacid and a halogen. substitution product of a hydrocarbonon asalt'ofthe acid corresponding to .said organic anhydrid, while regulating the temperature of the reacting materials.

",12.- A process ofmaking an anhydrid of 'an organic acid which comprises reacting upon a salt of such anacid with the reaction, products of a halogen substitution product of a hydrocarbon and an anhydrid of a mineral acid. I i 13. Aprocess of making an anhydrid of {an organic acid-said process comprising re- I -v acting upon a salt of the acid with carbonyl 9-. A process of producing organic anhyg drids-which comprises mixln sulfuric an'-' WALLACE A. BEATTY. Witnesses H. HUBSZRNE,v

CHAS. E. BRnoKoNs. 

